[...]... Motor-Dynamos, • • » 318 ELECTRO-DYNAMIC MACHINERY FOR CONTINUOUS CURRENTS CHAPTER I GENERAL PRINCIPLES OF DYNAMOS I By electro-dynamic machinery designed for the production, is meant any apparatus transference, measurement of energy through the medium utilization or of electricity Electro-dynamic machinery may, therefore, be classified under the following heads : or apparatus for converting mechanical... would, therefore, include not only the circuit conductors proper, but also various types of transformers, either station- ary or rotary Under receptive devices are included any devices for con- verting electrical energy into mechanical energy Strictly the term mechanical energy a wide interpretation, such for example, as would perspeaking, however, it is but fair to give to ELECTRO-DYNAMIC MACHINERY. .. consideration of the foregoing classification will show all cases of the application of electro-dynamic machinmechanical energy is transformed, by various devices, into electric energy, and utilized by various electro-receptive devices connected with the generators by means of conducting lines The electro-technical problem, involved in the practical application of electro-dynamic machinery, is, therefore, that... the receptive devices (3.) Devices for the reception and conversion of electric energy into some other desired form of energy (4.) Devices for the measurement of electric energy Under generating apparatus are included all forms of con'tinuous or alternating-current dynamos Under transmission circuits are kicluded not only conduct- ing lines or circuits in their various forms, but also the means whereby... satisfactorily perform its work at a given tive force of GENERAL PRINCIPLES OF DYNAMOS efficiency, mum that 3 and without overheating, with, however, the maxi- economy of construction and operation In other words, dynamo will be the best, electrically, which for a given weight, resistance and friction, produces the greatest electro- motive force 4 There are various ways in which the electromotive force dynamo... dimensions in electromagnetism The authors have therefore preferred to base ELECTRO-DYNAMIC MACHINERY 8 the formulae and reasoning fundamental units, in in order to this volume on the French, simplify the treatment, wel) elementary principles have been grasped, the transition to English measurements is easily effected by the student The following data will, therefore, be knowing that once the useful: I foot... The It will, therefore, be advisable to arrange dynamo-electric machines into general classes, before attempting to describe the structure and peculiarities of their various parts 14 Dynamos may be conveniently ing classes; viz divided into the follow- ELECTRO-DYNAMIC MACHINERY lo Constant potential machines, or those designed to main- (i.) tain at their terminals all a practically uniform E M F under... generator Fig II shows a form of continuous- current, self-exciting, compound-wound, sextipolar machine, arranged for direct connection to the main shaft of an engine The machine is pro- vided, as shown, with six collecting brushes Fig 12 shows an alternating-current, self-exciting, octopoiar generator for arc circuits Although this machine is an alter- nator j i e.y supplies alternating currents, it, nevertheless... poles in the field is, to a certain degree, a matter of ELECTRO-DYNAMIC MACHINERY 20 In almost choice rent dynamos are frequently bipolar all cases, directly-coupled, continuous- cur- multipolar, while belt-driven dynamos are Directly-coupled, continuous- current dy- namos are usually multipolar machines, owing to the fact that, in order to conform with engine construction, they have to be made with... Magnetic Fields Direction, Intensity, DisOutlined Flux Density Uniformity, Convergence, Divergence Tubes of Force Lines of Magnetic Force The Gauss Properties of Magnetic Flux M M F Ampere-Turn The Gilbert Flux tribution Paths, 29 CHAPTER IV NON-FERRIC MAGNETIC CIRCUITS The Oersted Ohm's Law Applied to Magnetic Circuits (Reluctance Magnetizing Force Ferric, Non-Ferric, and Aero-Ferric Circuits Magnetic Potential . Motor-Dynamos, • . • » . 318 ELECTRO-DYNAMIC MACHINERY FOR CONTINUOUS CURRENTS. CHAPTER I. GENERAL PRINCIPLES OF DYNAMOS. I. By electro-dynamic machinery is meant any apparatus designed for the production,. Telegraphy. Cloth, Price per Volume, $1.00. Electro-Dynamic Machinery. Cloth, $2.50. THE W. J. JOHNSTON COMPANY 253 Broadway, New York M ELECTRO-DYNAMIC MACHINERY FOR CONTINUOUS CURRENTS BY EDWIN jf HOUSTON, Ph such for example, as would per- 2 ELECTRO-DYNAMIC MACHINERY. mit the introduction of any device for translating electric energy into telephonic or telegraphic vibrations. Under devices for the